In Google Analytics found highest (100%) bounce rate from unknown (non set) language. Also when search traffic sources found that organic traffic coming from non related keywords and Referral sites gives more traffic and bounce rate.
See Bounce rate should be lesser that 30 % then only search engine though your website is good for the users and it is useful if your bounce rate is 100 % then your website is not all useful for the visitors better make changes in your on page